Even today you can play most games in a very high setting even with AA at acceptable framerates.
For over 3 years now this card could hold up to the top 15 high end grfx cards!
Not really, a hd5870 is about 3-4 times faster for example, the hardware side of pc gaming has advanced nicely, and the 8-9 series cards are now regarded as low end in the scheme of things by this point!
Still, this isn't the problem if they run the games to your standard, it's cool that cards last so long. It's only annoying when people bich about replacing them. If you want to max a newer, demanding game at 1920x1080 you sometimes need to spend money.
Naturally, you would have to spend a whole lot of cash for a new card. And a Gtx 8800 (GT/GTS too) can still hold up to now. They're the pioneers of Dx10 gaming, you can't just ignore that fact.
